Scalable approach to multi-dimensional bulk Si anodes via metal-assisted chemical etching
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- Scalable approach to multi-dimensional bulk Si anodes via metal-assisted chemical etching
- Bang, Byoung Man; Kim, Hyunjung; Song, Hyun-Kon; Cho, Jaephil; Park, Soojin
- Anode material; Battery performance; Bulk silicon; Charge capacities; Gram scale; High yield; High-performance anode materials; Initial Coulombic efficiency; Lithium insertion; Lithium-ion battery; Mass producible; Metal deposition; Metal-assisted chemical etching; Micro-scales; Multi-dimensional structure; Nano-porous silicon; Scalable approach; Silicon electrode; Specific design; Stable cycles; Synthetic routes; Volume change; Volumetric density
- Issue Date
- ROYAL SOC CHEMISTRY
- ENERGY & ENVIRONMENTAL SCIENCE, v.4, no.12, pp.5013 - 5019
- Specific design and optimization of the configuration of micro-scale materials can effectively enhance battery performance, including volumetric density. Herein, we employed commercially available low-cost bulk silicon powder to produce multi-dimensional silicon composed of porous nanowires and micro-sized cores, which can be used as anode materials in lithium-ion batteries, by combining a metal deposition and metal-assisted chemical etching process. Nanoporous silicon nanowires of 5-8 mu m in length and with a pore size of similar to 10 nm are formed in the bulk silicon particle. The silicon electrodes having multi-dimensional structures accommodate large volume changes of silicon during lithium insertion and extraction. These materials show a high reversible charge capacity of similar to 2400 mAh g(-1) with an initial coulombic efficiency of 91% and stable cycle performance. The synthetic route described herein is simple, low-cost, and mass producible (high yield of 40-50% in tens of gram scale), and thus, provides an effective method for producing high-performance anode materials.
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